package com.boot.dog.common.util;

import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletResponse;

import cn.hutool.core.util.StrUtil;
import lombok.experimental.UtilityClass;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import lombok.extern.slf4j.Slf4j;

/**
 * @Author: MaxLv
 * @Date: 2020/1/18
 */
@Slf4j
@UtilityClass
public class ExcelUtil {
    public void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass,
                            boolean isCreateHeader, HttpServletResponse response) {
        ExportParams exportParams = new ExportParams(title, sheetName);
        exportParams.setCreateHeadRows(isCreateHeader);
        defaultExport(list, pojoClass, response, exportParams);
    }

    public void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass,
                            HttpServletResponse response) {
        defaultExport(list, pojoClass, response, new ExportParams(title, sheetName));
    }

    public void exportExcel(List<Map<String, Object>> list, HttpServletResponse response) {
        defaultExport(list, response);
    }

    private void defaultExport(List<?> list, Class<?> pojoClass, HttpServletResponse response,
                               ExportParams exportParams) {
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        if (workbook != null) {
            downLoadExcel(response, workbook);
        }
    }

    private void downLoadExcel(HttpServletResponse response, Workbook workbook) {
        try {
            response.reset();
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode("export", "UTF-8"));
            workbook.write(response.getOutputStream());
        } catch (IOException e) {
            log.error("download excel", e);
        }
    }

    private void defaultExport(List<Map<String, Object>> list, HttpServletResponse response) {
        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
        if (workbook != null) {
            downLoadExcel(response, workbook);
        }
    }

    public <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        if (StrUtil.isBlank(filePath)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        } catch (Exception e) {
            log.error("import excel 1", e);
        }
        return list;
    }

    public <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows,
                                   Class<T> pojoClass) {
        if (file == null) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
        } catch (Exception e) {
            log.error("import excel 2", e);
        }
        return list;
    }

}